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8th February 11:34
External User
Posts: 1
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CMYK to RGB Error
I have a VB.NET application that accepts a 300 dpi CMYK Tiff and
downsizes it to an RGB JPEG, which works great. The only problem is the coloring seems to darken and become muddy, with oranges becoming browns, etc. Has anyone else had this happen, and hopefully found a way to fix it? |
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9th February 21:16
External User
Posts: 1
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CMYK to RGB Error
CMYK to RGB conversions are notoriously difficult. CMYK is generated for the
print industry using subtractive colour process whereas RGB is for screen display so the final conversion should take place with knowledge of the setting of the 4 colour scanner used for the origination and the colour temperature of the screen. Generally you should "tweak" the settings to whatever you think looks best. -- -- Bob Powell [MVP] Visual C#, System.Drawing Ramuseco Limited .NET consulting http://www.ramuseco.com Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. |
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9th February 21:16
External User
Posts: 1
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CMYK to RGB Error
Are there any general rules of thumb about how the 'tweaks' should
go? And do you know what is the best method for applying those changes? Thanks |
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11th February 06:36
External User
Posts: 1
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CMYK to RGB Error
I don't know of an automatic method. Do the copy and then post-process,
perhaps even by eye. You could try increasing the brightness and contrast by an amount. Up the brightness by 10% and increase contrast by 15%. -- Bob Powell [MVP] Visual C#, System.Drawing Ramuseco Limited .NET consulting http://www.ramuseco.com Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm All new articles provide code in C# and VB.NET. Subscribe to the RSS feeds provided and never miss a new article. |
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17th February 23:48
External User
Posts: 1
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CMYK to RGB Error
write an entire JPEG decoder. CMYK Jpegs can be loaded in a Bitmap object but
when they are drawn using DrawImage method they appear as a "negative" (it's not a real negative because I tried to revert the image but the result does not match the original). Thank you, Soso "cbsd.james" wrote: |
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Linear Mode
